What should I do about this teacher I'm infatuated with? (please read entirely)?

It would more than likely be best to transfer out of his cl if posible. lf you can do it with out setting of all kinds of alarms. You have done nothilng and neither has he realy. He is on the virge of crossing the forbidden line. If he crosses that line it could cost him, his job pluss his teaching licence. If you can stop that before it happens then you are more mature and a better person forl it.If he crosses that line he could also go to prison. From what you have said you do not want to distroy some one's lilfe and that is what would happen. Sooner or later he would get cought. Good Luck.